18193212 has 18 divisors (see below), whose sum is σ = 45988488. Its totient is φ = 6064392.

The previous prime is 18193211. The next prime is 18193243. The reversal of 18193212 is 21239181.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18193211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 252648 + ... + 252719.

It is an arithmetic number, because the mean of its divisors is an integer number (2554916).

Almost surely, 2^18193212 is an apocalyptic number.

18193212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18193212 is an abundant number, since it is smaller than the sum of its proper divisors (27795276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18193212 is a wasteful number, since it uses less digits than its factorization.

18193212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505377 (or 505372 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 18193212 is about 4265.3501614756. The cubic root of 18193212 is about 263.0085054621.

The spelling of 18193212 in words is "eighteen million, one hundred ninety-three thousand, two hundred twelve".